Bola Idor in Laravel with Cockroachdb

Broken Object Level Authorization (BOLA) occurs when an API fails to verify that a requesting user is permitted to access a specific object. In a Laravel application using CockroachDB as the backend, the risk is not introduced by CockroachDB itself, but by how the application builds and executes queries. If authorization checks are performed only at the query level — for example, by scoping records to an authenticated user ID — an attacker may still manipulate identifiers to reach records they should not see.

Consider a typical route that loads a user profile by ID:

// routes/web.php or api.php
Route::get('/profile/{id}', [ProfileController::class, 'show']);

If the controller directly fetches the record using the provided $id and only applies a simple where clause without validating ownership, an IDOR vulnerability exists:

// app/Http/Controllers/ProfileController.php
public function show($id)
{
    $profile = App\Models\Profile::find($id);
    return response()->json($profile);
}

In a CockroachDB-backed Laravel app, this becomes risky because CockroachDB supports distributed SQL and consistent reads across nodes. If the application relies on route or object identifiers that are predictable (e.g., sequential integers or UUIDs without ownership checks), an attacker can iterate through valid IDs and read other users’ profiles. The database will return the record if it exists, even when the authenticated user does not own it, because the query does not enforce tenant or ownership constraints.

Moreover, if the application uses CockroachDB’s secondary indexes or interleaved tables for performance, the presence of additional indexes does not enforce authorization. An attacker might also probe for different resource types (e.g., switching record types or polymorphic relations) to see how the application resolves them. Because CockroachDB preserves ACID semantics, the query will succeed and return data unless the application explicitly filters by the authenticated user or tenant context.

Real-world patterns that increase exposure include using raw queries that concatenate IDs, relying on route model binding without policy checks, or assuming UUIDs are unguessable without verifying ownership. OWASP API Top 10 A01:2023 Broken Object Level Authorization and common CVEs involving IDOR in API endpoints highlight the impact of such gaps.

Remediation focuses on ensuring every data access path enforces ownership or tenant context, regardless of how predictable or opaque the identifier is. Below are concrete Laravel patterns that work reliably with CockroachDB.

1. Always scope queries by authenticated user

Never trust incoming identifiers alone. Combine them with the authenticated user’s ID or tenant.

// app/Http/Controllers/ProfileController.php
public function show($id)
{
    $profile = Auth::user()->profiles()->find($id);
    if (! $profile) {
        abort(404);
    }
    return response()->json($profile);
}

In your Eloquent models, define the relationship so ownership is enforced at the query level:

// app/Models/User.php
public function profiles()
{
    return $this->hasMany(Profile::class);
}

2. Use policy-based authorization with Gate or Policies

Laravel’s authorization gates add an explicit check before data access:

// app/Providers/AuthServiceProvider.php
Gate::define('view-profile', function (User $user, $profileId) {
    return $user->profiles()->where('profiles.id', $profileId)->exists();
});

Then in the controller:

public function show($id)
{
    $this->authorize('view-profile', $id);
    $profile = Profile::where('id', $id)->where('user_id', auth()->id())->firstOrFail();
    return response()->json($profile);
}

3. Avoid exposing internal identifiers; use opaque identifiers

While CockroachDB handles UUIDs well, prefer Laravel’s builtidable UUID or ulid support to reduce predictability:

// migration
$table->uuid('id')->primary()->default(\\Ramsey\\Uuid\\Uuid::uuid4());
// or
$table->ulid();

Ensure routes reference the UUID/ULID, and scope by user:

$profile = Auth::user()->profiles()->where('id', $id)->firstOrFail();


4. Use explicit joins or subqueries for complex ownership
If profiles are accessed through an intermediate table or role-based constraints, use joins to enforce constraints at the SQL level:
$profile = DB::table('profiles')
    ->join('user_profiles', 'profiles.id', '=', 'user_profiles.profile_id')
    ->where('user_profiles.user_id', Auth::id())
    ->where('profiles.id', $id)
    ->select('profiles.*')
    ->firstOrFail();


5. Validate polymorphic relations carefully
If your app uses polymorphic relationships, ensure both the type and ID are validated against the authenticated context:
$document = Auth::user()->ownedDocuments()
    ->where('documentable_type', $request->input('type'))
    ->where('documentable_id', $request->input('id'))
    ->firstOrFail();


6. Consistent use of parameterized queries
Even when using CockroachDB’s PostgreSQL wire protocol, always use Eloquent or parameterized queries to avoid injection and ensure proper scoping:
$profile = Profile::where('id', $id)
    ->where('user_id', auth()->id())
    ->lockForShare() // optional, for read consistency
    ->first();